Barbara Bush helps a nun to fit on a hearing device during a 2012 event in Gulu, Uganda. She says was interested in architecture as a college student but became a global health activist after visiting East Africa with her parents.
A member of the Lesotho military looks on as he stands guard in front of an armed personnel carrier at the entrance of the army barracks in the capital Maseru on Saturday. Lesotho's Prime Minister Thomas Thabane has accused the army of staging a coup.
The orchids that produce vanilla beans have no natural pollinators in Madagascar; the plant must be pollinated by hand — a labor-intensive process with little margin for error.
Courtesy of Madécasse
Dr. Tom Frieden, director of the CDC, talks with staff from Doctors Without Borders during a visit to the nonprofit group's newest Ebola treatment center in Monrovia, Liberia.
Tommy Trenchard for NPR
Islamist fighters in the Libya Dawn coalition guard the entrance of the Tripoli International Airport on Sunday. After days of battles, they captured it from forces aligned with rogue general Khalifa Hifter.
Mahmud Turkia/AFP/Getty Images